Parenting Β· π°π· Korea
Korean Baby Growth Percentile
Korean baby growth percentile by WHO/KCDC LMS with 0-24 month growth curve.
About this tool
Korean Baby Growth Percentile lets parents enter weight, length, and head circumference of an infant (0~24 months). It computes 3rd / 10th / 25th / 50th / 75th / 90th / 97th percentiles using LMS parameters from WHO Child Growth Standards (2006) and Korean KCDC 2017, and plots the position on a growth-curve SVG. Below 24 months, WHO breastfed-baseline standards apply; above 24 months, KCDC Korean tables β matching Korean pediatric practice. A red alert appears outside the 3rd-97th band with a recommendation to see a pediatrician. Preterm-correction (corrected age) is supported. Inputs never leave your browser.
Use cases
Scenario 1
Self-track between checkups
Between the 4-month and 6-month exams, log weight/length monthly and watch for percentile shifts (e.g., 50% β 25%) to decide when to call the pediatrician.
Scenario 2
Preterm corrected age
Parents of a 34-week preemie toggle "preterm" to re-compute percentiles using corrected age (vs due date), avoiding false "failure-to-thrive" alarms from chronological age.
Scenario 3
Breastfed baby 4-month check
Since WHO is breastfed-baseline, formula-fed babies can sit a bit higher than 50th. The tool calls this out as normal variation.
Scenario 4
Pre-visit pediatrician notes
Before a visit, log the last 3 months and download the curve PNG; the pediatrician can scan the trajectory at a glance.
Scenario 5
Head-circumference 97th alert
If head circumference exceeds the 97th percentile, a red alert plus "see a pediatrician" prompt encourages parents to seek medical evaluation right away.
Features
- Auto switch between WHO 0-24mo and KCDC 2017 LMS
- 7-tier percentiles for weight, length, head circumference
- Growth curve SVG (3 / 50 / 97 + current point)
- Red alert below 3rd or above 97th
- Auto preterm corrected-age adjustment
- Bilingual KR/EN UI
- In-browser only β inputs never leave device
Frequently asked
- Q. WHO vs KCDC β which to use?
- A. Under 24 months WHO (breastfed optimal-growth) is used; from 2y on KCDC 2017 Korean tables apply β matching Korean pediatric practice.
- Q. Is 5th percentile a problem?
- A. Within 3rd-97th is statistically normal. Trajectory matters more than absolute value β if a child crosses 2+ major percentile lines (50β25β10), see a pediatrician.
- Q. How do I enter for a preterm baby?
- A. Toggle "preterm" and enter gestational weeks at birth β the tool corrects to the due date. Use corrected age until 24mo, chronological after.
- Q. Weight is dropping β is that ok?
- A. Crossing 2+ percentile lines downward (50β25β10) is a failure-to-thrive flag β get a pediatric evaluation.
- Q. Why does my clinic see a different number?
- A. Measurement method, clothing, recent feeding, and bowel state can shift values Β±0.2kg / Β±1cm. Use clinic measurements for formal diagnosis.
Sources / references
Related guides / blog posts
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How we run it / disclaimer
This tool is advisory and does not constitute legal, tax, medical, or financial advice. All calculations and document generation run in your browser; inputs are never sent to a server. Ads follow Google AdSense policy and are kept separate from tool accuracy.